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https://www.readbyqxmd.com/read/28732394/surface-charge-effects-on-the-electro-orientation-of-insulating-boron-nitride-nanotubes-in-aqueous-suspension
#1
Semih Cetindag, Bishnu Tiwari, Dongyan Zhang, Yoke Khin Yap, Sangil Kim, Jerry W Shan
The alignment of hexagonal boron-nitride nanotubes (BNNTs) in aqueous KCl solutions under spatially uniform electric fields was examined experimentally, using direct optical visualization to probe the orientation dynamics of individual BNNTs for different electric-field frequencies. Different from most previously studied nanowires and nanotubes, BNNTs are wide-bandgap materials which are essentially insulating at room temperature. We analyze the electro-orientation of BNNTs in the general context of polarizable cylindrical particles in liquid suspensions, whose behavior can fall into different regimes, including alignment due to Maxwell-Wagner induced dipoles at high frequencies, and alignment due to fluid motion of the electrical double layer around the particles at lower frequencies...
May 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28732322/effects-of-environmental-pollutants-on-signaling-pathways-in-rat-pituitary-gh3-adenoma-cells
#2
Nicoletta Fortunati, Federica Guaraldi, Valentina Zunino, Federica Penner, Valentina D'Angelo, Francesco Zenga, Francesca Pecori Giraldi, Maria Graziella Catalano, Emanuela Arvat
An increased rate of acromegaly was reported in industrialized areas, suggesting an involvement of environmental pollutants in the pathogenesis and behavior of GH-secreting pituitary adenomas. Based on these premises, the aim of the study was to evaluate the effects of some widely diffused pollutants (i.e. benzene, BZ; bis(2-ethylhexyl) phthalate, DEHP and polychlorinated biphenyls, PCB) on growth hormone secretion, the somatostatin and estrogenic pathways, viability and proliferation of rat GH-producing pituitary adenoma (GH3) cells...
July 18, 2017: Environmental Research
https://www.readbyqxmd.com/read/28732318/the-experimental-tobacco-marketplace-ii-substitutability-and-sex-effects-in-dual-electronic-cigarette-and-conventional-cigarette-users
#3
Amanda J Quisenberry, Mikhail N Koffarnus, Leonard H Epstein, Warren K Bickel
AIM: The aim of the current study was to evaluate tobacco product purchasing in the Experimental: Tobacco Marketplace (ETM) among male and female smokers who also use e-cigarettes. We hypothesized a high substitution profile for e-cigarettes and that males would purchase more Snus than females. METHODS: The ETM is an online market used in clinical abuse liability research to mimic real-world purchasing patterns. Tobacco products, including each participant's usual choice of conventional and e-cigarettes, were presented along with a price and description of nicotine content...
July 5, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28732317/cross-lagged-relations-between-motives-and-substance-use-can-use-strengthen-your-motivation-over-time
#4
Christine A Lee, Karen J Derefinko, Heather A Davis, Richard Milich, Donald R Lynam
Motives for substance use have garnered considerable attention due to the strong predictive utility of this construct, both in terms of use and problems associated with use. The current study examined the cross-lagged relations between alcohol use and motives, and marijuana use and motives over three yearly assessment periods in a large sample (N=526, 48% male) of college students. The relations between substance use and motives were assessed at each time point, allowing for the examination of these inter-relations over time...
June 28, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28732313/biomechanics-of-cell-rearrangements-in-drosophila
#5
REVIEW
Boris Guirao, Yohanns Bellaïche
To acquire their adequate size and shape, living tissues grow and substantially deform as they develop. To do so, the cells making up the tissue can grow and deform as well, but they can also divide, intercalate and die. Among those cell behaviors, cell intercalation, also named cell rearrangement, is a major contributor to the morphogenesis of many cohesive tissues since it enables tissues to drastically deform as they develop while keeping their cohesiveness and avoiding extreme deformation of their cells...
July 18, 2017: Current Opinion in Cell Biology
https://www.readbyqxmd.com/read/28732311/solid-and-aqueous-magnetoliposomes-as-nanocarriers-for-a-new-potential-drug-active-against-breast-cancer
#6
Ana Rita O Rodrigues, Pedro M F Mendes, Pedro M L Silva, V A Machado, Bernardo G Almeida, J P Araújo, Maria-João R P Queiroz, Elisabete M S Castanheira, Paulo J G Coutinho
Iron oxide nanoparticles, with diameters around 12nm, were synthesized by coprecipitation method. The magnetic properties indicate a superparamagnetic behavior with a coercive field of 9.7Oe and a blocking temperature of 118K. Both aqueous and solid magnetoliposomes containing magnetite nanoparticles have sizes below 150nm, suitable for biomedical applications. Interaction between both types of magnetoliposomes and models of biological membranes was proven. A new antitumor compound, a diarylurea derivative of thienopyridine, active against breast cancer, was incorporated in both aqueous and solid magnetoliposomes, being mainly located in the lipid membrane...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28732285/infrared-dispersion-analysis-and-raman-scattering-spectra-of-taurine-single-crystals
#7
Roberto L Moreira, Ricardo P S M Lobo, Anderson Dias
A comprehensive set of optical vibrational modes of monoclinic taurine crystals was determined by Raman scattering, and infrared reflectivity and transmission spectroscopies. By using appropriate scattering/reflection geometries, the vibrational modes were resolved by polarization and the most relevant modes of the crystal could be assigned. In particular, we were able to review the symmetry of the gerade modes and to resolve ambiguities in the literature. Owing to the non-orthogonal character of Bu modes in monoclinic crystals (lying on the optic axial plane), we carried out a generalized Lorentz dispersion analysis consisting of simultaneous adjust of infrared-reflectivity spectra at various light polarization angles...
July 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28732261/predictors-of-disclosure-management-behavior-at-the-end-of-1-year-follow-up-in-korean-adults-with-newly-diagnosed-epilepsy
#8
Sang-Ahm Lee, Soon-Kee No, Hyungkook Park, Ok-Joon Kim, Jee-Hyun Kwon, Ji-Yeon Ryu, Sang-Moo Lee, Kwang-Deog Jo
PURPOSE: Epilepsy is a concealable stigmatizing condition. We investigated the factors predicting disclosure management behavior in Korean adults with newly diagnosed epilepsy. METHODS: This longitudinal multicenter study included Korean adults with newly diagnosed epilepsy. Using statistical analyses, we determined at the end of a 1-year follow-up whether Disclosure Management Scale (DMS) scores were predicted by demographic, clinical, and psychosocial variables, including felt stigma, stress coping style, personality traits, social support, and experienced discrimination from society...
July 18, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28732256/using-the-theory-of-planned-behavior-incorporated-with-perceived-barriers-to-explore-sexual-counseling-services-delivered-by-healthcare-professionals-in-individuals-suffering-from-epilepsy
#9
Chung-Ying Lin, Xavier C C Fung, Mehdi Nikoobakht, Andrea Burri, Amir H Pakpour
People with epilepsy (PWE) are highly likely to suffer from sexual dysfunction, and dealing with this issue is a challenge for healthcare providers. Unfortunately, there is no theory-driven study that has investigated the counseling practice of healthcare providers for sexual problems in PWE. Therefore, we decided to apply the well-established Theory of Planned Behavior (TPB) to examine factors associated with healthcare providers' sexual counseling in PWE. Apart from TPB, perceived barriers toward providing counseling could be a possible factor that needs to be investigated as well...
July 18, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28732248/effects-of-adults-contingent-responding-on-infants-behavior-in-ambiguous-situations
#10
Gunilla Stenberg
We examined the effect of adults' contingency in responding to infants' behavior in an ambiguous situation in two experiments. In Experiment 1, forty-four 12-month-old infants were exposed to an ambiguous toy. An unfamiliar adult responded either contingently or non-contingently to the infant's bids and then presented the toy and provided positive information. During toy presentation, infants in the non-contingent condition looked less at the experimenter than infants in the contingent condition. In a concluding free-play situation infants in the non-contingent condition played less and tended to touch the toy less...
July 18, 2017: Infant Behavior & Development
https://www.readbyqxmd.com/read/28732235/medication-takeovers-covert-druggings-and-behavioral-control-in-alzheimer-s
#11
Brandon Berry, Ester Carolina Apesoa-Varano
Older adults consume the most prescription medication in the U.S. For those who develop Alzheimer's disease, risk of medication misuse increases with the progression of the disease. Family members commonly intervene to lessen risks by taking over the management and administering of a medication regimen. Despite the potential for grave harm around the misuse of powerful drugs, few studies provide insight into the household social context of medication use for this disease. Drawing on 60 in-depth interviews conducted in four waves over 2...
July 6, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28732217/finite-element-evaluation-of-stable-fixation-in-combined-mandibular-fractures
#12
Thalita Regina Vieira E Oliveira, Daniel Takanori Kemmoku, Jorge Vicente Lopes da Silva, Pedro Yoshito Noritomi, Luis Augusto Passeri
PURPOSE: The fixation of combined mandibular fractures, especially symphyseal-condylar fractures, although occurring commonly and having a higher complication rate in the clinic, is rarely investigated regarding predictable therapeutic approaches. Thus this study's aim was to assess different forms of condylar fixation when combined with symphyseal fracture fixation. MATERIALS AND METHODS: Using finite element models, we analyzed the stress distribution that occurs when a condylar fracture is fixed with 1 miniplate, 2 miniplates, or a trapezoidal condylar miniplate and when a symphyseal fracture is fixed with 2 parallel plates, 2 perpendicular plates, or 2 lag screws...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28732164/electrochemical-intercalation-of-mg-2-into-anhydrous-and-hydrated-crystalline-tungsten-oxides
#13
Ruocun Wang, Ching-Chang Chung, Yang Liu, Jacob L Jones, Veronica Augustyn
The reversible intercalation of multivalent cations, especially Mg(2+), into a solid-state electrode is an attractive mechanism for next-generation energy storage devices. These reactions typically exhibit poor kinetics due to a high activation energy for interfacial charge-transfer and slow solid-state diffusion. Interlayer water in V2O5 and MnO2 has been shown to improve Mg(2+) intercalation kinetics in non-aqueous electrolytes. Here, the effect of structural water on Mg(2+) intercalation in non-aqueous electrolytes is examined in crystalline WO3 and the related hydrated and layered WO3·nH2O (n = 1, 2)...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732157/large-scale-statistics-for-threshold-optimization-of-optically-pumped-nanowire-lasers
#14
Juan Arturo Alanis, Dhruv Saxena, Sudha Mokkapati, Nian Jiang, Kun Peng, Xiaoyan Tang, Lan Fu, Hark Hoe Tan, Chennupati Jagadish, Patrick Parkinson
Single nanowire lasers based on bottom-up III-V materials have been shown to exhibit room-temperature near-infrared lasing, making them highly promising for use as nanoscale, silicon-integrable and coherent light sources. While lasing behavior is reproducible, small variations in growth conditions across a substrate arising from the use of bottom-up growth techniques can introduce inter-wire disorder, either through geometric or material inhomogeneity. Nanolasers critically depend on both high material quality and tight dimensional tolerances, and as such, lasing threshold is both sensitive to, and a sensitive probe of such inhomogeneity...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28732154/ironing-out-genes-in-the-environment-an-experimental-study-of-the-dna-goethite-interface
#15
Michael P Schmidt, Carmen Enid Martinez
DNA fate in soil plays an important role in the cycling of genetic information in the environment. Adsorption onto mineral surfaces has great impact on this function. This study probes the kinetics, equilibrium behavior and bonding mechanisms associated with adsorption of DNA onto goethite, a common soil mineral. Surface sensitive ATR-FTIR and XPS approaches are applied to directly characterize the DNA-goethite interface. Adsorption kinetics follow a pseudo-first order model, suggesting adsorption rate is surface limited...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732141/intraoperative-ultrasound-for-prediction-of-hepatocellular-carcinoma-biological-behavior-prospective-comparison-with-pathology
#16
Roberto Santambrogio, Claudia Cigala, Matteo Barabino, Marco Maggioni, Giovanna Scifo, Savino Bruno, Emanuela Bertolini, Enrico Opocher, Gaetano Bulfamante
BACKGROUND AND AIMS: Preoperative prediction of both microinvasive hepatocellular carcinoma and histological grade of hepatocellular carcinoma is pivotal to treatment planning and prognostication. Aim of the study was to evaluate whether some intraoperative ultrasound features correlate with both the presence of same histological patterns and differentiation grade of hepatocellular carcinoma on the histologic features of the primary resected tumor. METHODS: All patients with single, small hepatocellular carcinoma that underwent hepatic resection were included in this prospective double-blind study: the intraoperative ultrasound patterns of nodule were registered and compared with similar histological features...
July 21, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28732136/an-approach-to-estimate-the-activation-energies-of-fragmentation-occurring-in-quadrupole-collision-cell-of-the-mass-spectrometer
#17
Ákos Kuki, Lajos Nagy, Miklós Zsuga, Sándor Kéki
The classical semi-quantitative Rice-Ramsperger-Kassel (RRK) theory was used for the calculation of the internal energy dependent reaction rate coefficient of the collision-induced dissociation (CID) reaction in tandem mass spectrometry (MS/MS). The survival yield (SY) was determined by the reaction rate equation for the unimolecular dissociation of the precursor ion. The parameters of the rate equation and the RRK model were approximated based on the instrumental conditions. We used the RRK equation for the description of the basic behavior of the fragmentation reactions and for the estimation of the internal energy of the precursor ion...
July 21, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28732133/ionization-and-collision-induced-dissociation-of-steroid-bis-glucuronides
#18
Argitxu Esquivel, Xavier Matabosch, Aristotelis Kotronoulas, Georgina Balcells, Jesús Joglar, Rosa Ventura
Studies on steroid metabolism are of utmost importance to improve the detection capabilities of anabolic androgenic steroids (AAS) misuse in sports drug testing. In humans, glucuronoconjugates are the most abundant phase II metabolites of AAS. Bis-glucuronidation is a reaction where two separated functional groups on the same molecule are conjugated with glucuronic acid. These metabolites have not been studied in depth for steroids and could be interesting markers for doping control. The aim of the present work was to study the ionization and collision induced dissociation of steroid bis-glucuronides to be able to develop mass spectrometric analytical strategies for their detection in urine samples after AAS administration...
July 21, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28732042/numerical-study-on-the-lubrication-performance-of-compression-ring-cylinder-liner-system-with-spherical-dimples
#19
Cheng Liu, Yan-Jun Lu, Yong-Fang Zhang, Sha Li, Norbert Müller
The effects of surface texture on the lubrication performance of a compression ring-cylinder liner system are studied in this paper. By considering the surface roughness of the compression ring and cylinder liner, a mixed lubrication model is presented to investigate the tribological behaviors of a barrel-shaped compression ring-cylinder liner system with spherical dimples on the liner. In order to determine the rupture and reformulation positions of fluid film accurately, the Jacoboson-Floberg-Olsson (JFO) cavitation boundary condition is applied to the mixed lubrication model for ensuring the mass-conservative law...
2017: PloS One
https://www.readbyqxmd.com/read/28732034/neglecting-the-call-of-the-wild-captive-frogs-like-the-sound-of-their-own-voice
#20
Luiza Figueiredo Passos, Gerardo Garcia, Robert John Young
Acoustic communication is highly influential in the expression of social behavior by anuran amphibians, transmitting information about the individual's physical condition and motivation. We studied the phonotactic (approach movements) responses of wild and captive male golden mantella frogs to conspecific wild and captive playback calls to determine the impact of captivity on social behaviour mediated by vocalisations. Calls were recorded from one wild and two captive populations. Phonotaxis experiments were then conducted by attracting M...
2017: PloS One
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